.chat-container{display:flex;flex-direction:column;height:100%;overflow:hidden}.chat-header{padding:14px 24px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;flex-shrink:0}.chat-session-name{font-weight:600;font-size:15px}.chat-hint{font-size:12px;color:var(--text-muted)}.messages-area{flex:1;overflow-y:auto;padding:24px;display:flex;flex-direction:column;gap:16px}.welcome-message{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:24px;max-width:680px;margin:0 auto}.welcome-message h3{font-size:18px;margin-bottom:8px}.welcome-message p{color:var(--text-muted);font-size:14px;margin-bottom:16px}.examples-label{font-size:12px;color:var(--text-muted);margin-bottom:8px}.example-prompts{display:flex;flex-wrap:wrap;gap:8px}.example-chip{background:var(--surface2);border:1px solid var(--border);color:var(--text);padding:6px 12px;border-radius:20px;font-size:13px;cursor:pointer;transition:background 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5px;border-radius:4px;font-family:var(--font-mono);font-size:13px}.message.assistant .message-bubble pre{background:#0006;border:1px solid var(--border);border-radius:var(--radius);padding:12px;overflow-x:auto;margin:8px 0}.message.assistant .message-bubble pre code{background:none;padding:0;font-size:13px}.user-pre{white-space:pre-wrap;font-family:var(--font-mono);font-size:13px;margin:0}.message-time{font-size:11px;color:var(--text-muted);padding:0 4px}.typing{display:flex;align-items:center;gap:5px;padding:14px 18px}.dot{width:7px;height:7px;background:var(--text-muted);border-radius:50%;animation:bounce 1.2s infinite}.dot:nth-child(2){animation-delay:.2s}.dot:nth-child(3){animation-delay:.4s}@keyframes bounce{0%,80%,to{transform:scale(.8);opacity:.5}40%{transform:scale(1);opacity:1}}.input-area{border-top:1px solid var(--border);padding:16px 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.15s;min-height:80px}.message-input:focus{border-color:var(--accent2)}.message-input::placeholder{color:var(--text-muted);font-family:var(--font-sans)}.send-btn{background:var(--accent2);color:#0d1117;border:none;padding:10px 20px;border-radius:var(--radius);font-size:14px;font-weight:600;cursor:pointer;transition:opacity .15s;height:44px;white-space:nowrap}.send-btn:hover{opacity:.85}.send-btn:disabled{opacity:.4;cursor:not-allowed}.input-hint{font-size:11px;color:var(--text-muted);margin-top:6px;text-align:right}.sidebar{width:240px;min-width:240px;background:var(--surface);border-right:1px solid var(--border);display:flex;flex-direction:column;overflow:hidden}.sidebar-header{display:flex;align-items:center;justify-content:space-between;padding:16px;border-bottom:1px solid var(--border)}.sidebar-title{font-weight:700;font-size:15px;display:flex;align-items:center;gap:6px}.logo-icon{font-size:18px}.new-session-btn{background:var(--surface2);color:var(--text);border:1px solid var(--border);width:28px;height:28px;border-radius:6px;font-size:18px;line-height:1;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background .15s}.new-session-btn:hover{background:var(--border)}.session-list{flex:1;overflow-y:auto;padding:8px 0}.no-sessions{color:var(--text-muted);font-size:13px;padding:16px;text-align:center}.session-item{display:flex;align-items:center;justify-content:space-between;padding:8px 16px;cursor:pointer;border-radius:0;transition:background .1s;gap:8px}.session-item:hover{background:var(--surface2)}.session-item.active{background:var(--user-bubble)}.session-label{flex:1;font-size:13px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;outline:none;border-radius:3px;cursor:text}.session-label:focus{background:var(--surface2);padding:2px 4px}.delete-btn{background:none;border:none;color:var(--text-muted);font-size:18px;cursor:pointer;line-height:1;padding:0 2px;opacity:0;transition:opacity .15s}.session-item:hover .delete-btn{opacity:1}.delete-btn:hover{color:var(--accent)}.sidebar-footer{padding:12px 16px;border-top:1px solid var(--border)}.footer-link{color:var(--text-muted);font-size:12px;text-decoration:none}.footer-link:hover{color:var(--accent2)}.app-layout{display:flex;height:100vh;overflow:hidden}.main-content{flex:1;overflow:hidden;display:flex;flex-direction:column}.empty-state{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;padding:40px;text-align:center}.empty-icon{font-size:56px}.empty-state h2{font-size:28px;font-weight:700;color:var(--text)}.empty-state p{max-width:480px;color:var(--text-muted);font-size:16px}.btn-primary{background:var(--accent2);color:#0d1117;border:none;padding:10px 24px;border-radius:var(--radius);font-size:15px;font-weight:600;cursor:pointer;transition:opacity .15s}.btn-primary:hover{opacity:.85}.btn-primary:disabled{opacity:.5;cursor:not-allowed}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--bg: #0d1117;--surface: #161b22;--surface2: #21262d;--border: #30363d;--accent: #f78166;--accent2: #58a6ff;--text: #e6edf3;--text-muted: #8b949e;--user-bubble: #1f3a5f;--assistant-bubble: #1a2332;--font-mono: "SF Mono", "Fira Code", "Cascadia Code", monospace;--font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--radius: 8px;--radius-lg: 14px}html,body,#root{height:100%}body{background:var(--bg);color:var(--text);font-family:var(--font-sans);font-size:15px;line-height:1.6}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}